Photographing optical lens assembly

Abstract

An photographing optical lens assembly includes, in order from an object side to an image side, a first lens element with positive refractive power having a convex object-side surface, a second lens element, a third lens element, a fourth lens element having at least one aspheric surface, a fifth lens element having a convex object-side surface and a concave image-side surface with at least one surface being aspheric and at least one inflection point being formed, and a sixth lens element having a concave image-side surface with at least one surface being aspheric. By adjusting the curvature radii of the fifth lens element, the photographing optical lens assembly can stay compact and correct the aberration while obtaining superior imaging quality.

1. A photographing optical lens assembly comprising, in order from an object side to an image side:
 a first lens element with positive refractive power having a convex object-side surface; 
 a second lens element; 
 a third lens element; 
 a fourth lens element with at least one aspheric surface; 
 a fifth lens element with a convex object-side surface and a concave image-side surface having at least one inflection point, and at least one of the object-side surface and the image-side surface of the fifth lens element being aspheric; and 
 a sixth lens element with an object-side surface and a concave image-side surface, at least one of the image-side surface and the object-side surface of the sixth lens element being aspheric; 
 the photographing optical lens assembly satisfying the following condition:
   −0.3<( R   9   −R   10 )/( R   9   +R   10 )<0.6
 
 
 wherein R 9  is a curvature radius of the object-side surface of the fifth lens element, and R 10  is a curvature radius of the image-side surface of the fifth lens element. 
 
     
     
       2. The photographing optical lens assembly according to  claim 1 , wherein the sixth lens element has at least one inflection point, the fifth lens element and the sixth lens element are made of plastic. 
     
     
       3. The photographing optical lens assembly according to  claim 2 , wherein the photographing optical lens assembly satisfies the following condition:
   0.8 <f/f   1 <1.9 
 wherein f is a focal length of the photographing optical lens assembly, and f 1  is a focal length of the first lens element. 
 
     
     
       4. The photographing optical lens assembly according to  claim 3 , further comprising a stop, and the photographing optical lens assembly satisfying the following condition:
   0.75 <SD/TD< 1.10 
 wherein SD is an axial distance between the stop and the image-side surface of the sixth lens element, and TD is an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element. 
 
     
     
       5. The photographing optical lens assembly according to  claim 4 , further comprising an image plane, and the photographing optical lens assembly satisfying the following condition:
   0.10 <BFL/TTL< 0.35 
 wherein BFL is a back focal length of the photographing optical lens assembly, and TTL is an axial distance between the object-side surface of the first lens element and the image plane. 
 
     
     
       6. The photographing optical lens assembly according to  claim 4 , wherein the object-side surface of the fourth lens element is concave, and the image-side surface of the fourth lens element is convex. 
     
     
       7. The photographing optical lens assembly according to  claim 5 , wherein the photographing optical lens assembly satisfies the following condition:
   0.1 <R   12   /f< 0.5 
 wherein R 12  is a curvature radius of the image-side surface of the sixth lens element, and f is a focal length of the photographing optical lens assembly. 
 
     
     
       8. The photographing optical lens assembly according to  claim 5 , wherein the photographing optical lens assembly satisfies the following condition:
   ( T   23   +T   45 )/ T   34 <1.0 
 T 23  is an axial distance between the second lens element and the third lens element, T 34  is an axial distance between the third lens element and the fourth lens element, and T 45  is an axial distance between the fourth lens element and the fifth lens element. 
 
     
     
       9. The photographing optical lens assembly according to  claim 6 , further comprising an image sensor and an image plane, and the photographing optical lens assembly satisfying the following condition:
     TTL/ImgH< 2.5 
 wherein ImgH is one half of the diagonal length of the effective photosensitive area of the image sensor, and TTL is an axial distance between the object-side surface of the first lens element and the image plane. 
 
     
     
       10. The photographing optical lens assembly according to  claim 6 , wherein the refractive power of the second lens element is negative, the refractive power of the third lens element is positive, the image-side surface of the third lens element is concave, and the object-side surface of the sixth lens element is convex. 
     
     
       11. The photographing optical lens assembly according to  claim 1 , wherein the photographing optical lens assembly satisfies the following condition:
   | f/f   4   |+|f/f   5   |+|f/f   6 |<1.5 
 wherein f is a focal length of the photographing optical lens assembly, f 4  is a focal length of the fourth lens element, f 5  is a focal length of the fifth lens element, and f 6  is a focal length of the sixth lens element. 
 
     
     
       12. The photographing optical lens assembly according to  claim 11 , wherein the photographing optical lens assembly satisfies the following condition:
   0.05<( CT   2   +CT   3 )/ f< 0.19 
 wherein CT 2  is a central thickness of the second lens element, CT 3  is a central thickness of the third lens element, and f is a focal length of the photographing optical lens assembly. 
 
     
     
       13. The photographing optical lens assembly according to  claim 11 , wherein the photographing optical lens assembly satisfies the following condition:
   −0.3<( R   7   −R   8 )/( R   7   +R   8 )<0.5
 
 wherein R 7  is a curvature radius of the object-side surface of the fourth lens element, and R 8  is a curvature radius of the image-side surface of the fourth lens element. 
 
     
     
       14. The photographing optical lens assembly according to  claim 11 , wherein the photographing optical lens assembly satisfies the following condition:
   23 <V   1   −V   2 <40 
 wherein V 1  is an Abbe number of the first lens element, and V 2  is an Abbe number of the second lens element. 
 
     
     
       15. A photographing optical lens assembly comprising, in order from an object side to an image side:
 a first lens element with positive refractive power having a convex object-side surface; 
 a second lens element; 
 a third lens element; 
 a fourth lens element having a concave object-side surface and a convex image-side surface, and at least one of the object-side surface and the image-side surface of the fourth lens element being aspheric; 
 a fifth lens element made of plastic having a convex object-side surface and a concave image-side surface, at least one of the object-side surface and the image-side surface of the fifth lens element being aspheric; and 
 a sixth lens element made of plastic having a convex object-side surface and a concave image-side surface, at least one of the object-side surface and the image-side surface of the sixth lens element being aspheric. 
 
     
     
       16. The photographing optical lens assembly according to  claim 15 , wherein the fifth lens element and the sixth lens element each has at least one inflection point. 
     
     
       17. The photographing optical lens assembly according to  claim 15 , further comprising a stop, and the photographing optical lens assembly satisfying the following condition:
   0.75 <SD/TD< 1.10 
 wherein SD is an axial distance between the stop and the image-side surface of the sixth lens element, and TD is an axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element. 
 
     
     
       18. The photographing optical lens assembly according to  claim 16 , wherein the refractive power of the second lens element is negative. 
     
     
       19. The photographing optical lens assembly according to  claim 18 , wherein the photographing optical lens assembly satisfies the following condition:
   0.05<( CT   2   +CT   3 )/ f< 0.19 
 wherein CT 2  is a central thickness of the second lens element, CT 3  is a central thickness of the third lens element, and f is a focal length of the photographing optical lens assembly. 
 
     
     
       20. The photographing optical lens assembly according to  claim 18 , wherein the photographing optical lens assembly satisfies the following conditions:
   −0.3<( R   7   −R   8 )/( R   7   +R   8 )<0.5; and
 
   −0.3<( R   9   −R   10 )/( R   9   +R   10 )<0.6
 
 wherein R 7  is a curvature radius of the object-side surface of the fourth lens element, R 8  is a curvature radius of the image-side of the fourth lens element, R 9  is a curvature radius of the object-side surface of the fifth lens element, and R 10  is a curvature radius of the image-side surface of the fifth lens element. 
 
     
     
       21. The photographing optical lens assembly according to  claim 17 , further comprising an image sensor and an image plane, and the photographing optical lens assembly satisfying the following conditions:
   23 <V   1   −V   2 <40; and 
     TTL/ImgH< 2.5 
 wherein ImgH is one half of the diagonal length of the effective photosensitive area of the image sensor, TTL is an axial distance between the object-side surface of the first lens element and the image plane, V 1  is an Abbe number of the first lens element, and V 2  is an Abbe number of the second lens element. 
 
     
     
       22. The photographing optical lens assembly according to  claim 17 , wherein the photographing optical lens assembly satisfies the following conditions:
   | f/f   4   |+|f/f   5   |+|f/f   6 |<1.5 
 wherein f is a focal length of the photographing optical lens assembly, f 4  is a focal length of the fourth lens element, f 5  is a focal length of the fifth lens element, and f 6  is a focal length of the sixth lens element.